Which retail payment innovation was patented in 1879 by James Ritty after he observed ship propeller counting technology, primarily to prevent employee theft?

Before digital payments and modern POS systems, retail transactions were revolutionized by a single invention that changed how stores operated forever. This poll tests your knowledge of retail payment system history and how one technological innovation transformed commerce, security, and employee accountability in the retail world. Do you know the origins of the tools that made modern retail possible?

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The mechanical cash register (nicknamed 'The Incorruptible Cashier')
The credit card imprinter (called 'The ZipZap')
The perforated sales receipt (known as 'The Customer's Copy')
The automatic change dispenser (branded as 'The Correct Count')